855402631 has 2 divisors, whose sum is σ = 855402632. Its totient is φ = 855402630.

The previous prime is 855402577. The next prime is 855402649. The reversal of 855402631 is 136204558.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-855402631 is a prime.

It is a super-2 number, since 2×855402631² = 1463427322243444322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (855402671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427701315 + 427701316.

It is an arithmetic number, because the mean of its divisors is an integer number (427701316).

Almost surely, 2^855402631 is an apocalyptic number.

855402631 is a deficient number, since it is larger than the sum of its proper divisors (1).

855402631 is an equidigital number, since it uses as much as digits as its factorization.

855402631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 855402631 is about 29247.2670689075. The cubic root of 855402631 is about 949.2709571940.

The spelling of 855402631 in words is "eight hundred fifty-five million, four hundred two thousand, six hundred thirty-one".